____ is known to everyone that * is part of China.

问题描述:

____ is known to everyone that * is part of China.
____ is known to everyone that * is part of China.
A.As B.Which C.It D.What
为何不选D?

选择C
当主语部分太长时为了句子平衡采用it作形式主语.所谓形式是指句子的真正主语将在句子末段出现.